[PATCH ghak90 V5 00/10] audit: implement container identifier

Implement kernel audit container identifier. This patchset is a fifth based on the proposal document (V3) posted: https://www.redhat.com/archives/linux-audit/2018-January/msg00014.html The first patch was the last patch from ghak81 that was absorbed into this patchset since its primary justification is the rest of this patchset. The second patch implements the proc fs write to set the audit container identifier of a process, emitting an AUDIT_CONTAINER_OP record to announce the registration of that audit container identifier on that process. This patch requires userspace support for record acceptance and proper type display. The third implements reading the audit container identifier from the proc filesystem for debugging. This patch wasn't planned for upstream inclusion but is starting to become more likely. The fourth implements the auxiliary record AUDIT_CONTAINER if an audit container identifier is associated with an event. This patch requires userspace support for proper type display. The 5th adds signal and ptrace support. The 6th creates a local audit context to be able to bind a standalone record with a locally created auxiliary record. The 7th patch adds audit container identifier records to the user standalone records. The 8th adds audit container identifier filtering to the exit, exclude and user lists. This patch adds the AUDIT_CONTID field and requires auditctl userspace support for the --contid option. The 9th adds network namespace audit container identifier labelling based on member tasks' audit container identifier labels. The 10th adds audit container identifier support to standalone netfilter records that don't have a task context and lists each container to which that net namespace belongs. Example: Set an audit container identifier of 123456 to the "sleep" task: sleep 2& child=$! echo 123456 > /proc/$child/audit_containerid; echo $? ausearch -ts recent -m container_op echo child:$child contid:$( cat /proc/$child/audit_containerid) This should produce a record such as: type=CONTAINER_OP msg=audit(2018-06-06 12:39:29.636:26949) : op=set opid=2209 old-contid=18446744073709551615 contid=123456 pid=628 auid=root uid=root tty=ttyS0 ses=1 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 comm=bash exe=/usr/bin/bash res=yes Example: Set a filter on an audit container identifier 123459 on /tmp/tmpcontainerid: contid=123459 key=tmpcontainerid auditctl -a exit,always -F dir=/tmp -F perm=wa -F contid=$contid -F key=$key perl -e "sleep 1; open(my \$tmpfile, '>', \"/tmp/$key\"); close(\$tmpfile);" & child=$! echo $contid > /proc/$child/audit_containerid sleep 2 ausearch -i -ts recent -k $key auditctl -d exit,always -F dir=/tmp -F perm=wa -F contid=$contid -F key=$key rm -f /tmp/$key This should produce an event such as: type=CONTAINER_ID msg=audit(2018-06-06 12:46:31.707:26953) : contid=123459 type=PROCTITLE msg=audit(2018-06-06 12:46:31.707:26953) : proctitle=perl -e sleep 1; open(my $tmpfile, '>', "/tmp/tmpcontainerid"); close($tmpfile); type=PATH msg=audit(2018-06-06 12:46:31.707:26953) : item=1 name=/tmp/tmpcontainerid inode=25656 dev=00:26 mode=file,644 ouid=root ogid=root rdev=00:00 obj=unconfined_u:object_r:user_tmp_t:s0 nametype=CREATE cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 type=PATH msg=audit(2018-06-06 12:46:31.707:26953) : item=0 name=/tmp/ inode=8985 dev=00:26 mode=dir,sticky,777 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:tmp_t:s0 nametype=PARENT cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 type=CWD msg=audit(2018-06-06 12:46:31.707:26953) : cwd=/root type=SYSCALL msg=audit(2018-06-06 12:46:31.707:26953) : arch=x86_64 syscall=openat success=yes exit=3 a0=0xffffffffffffff9c a1=0x5621f2b81900 a2=O_WRONLY|O_CREAT|O_TRUNC a3=0x1b6 items=2 ppid=628 pid=2232 auid=root uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=ttyS0 ses=1 comm=perl exe=/usr/bin/perl subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=tmpcontainerid Example: Test multiple containers on one netns: sleep 5 & child1=$! containerid1=123451 echo $containerid1 > /proc/$child1/audit_containerid sleep 5 & child2=$! containerid2=123452 echo $containerid2 > /proc/$child2/audit_containerid iptables -I INPUT -i lo -p icmp --icmp-type echo-request -j AUDIT --type accept iptables -I INPUT -t mangle -i lo -p icmp --icmp-type echo-request -j MARK --set-mark 0x12345555 sleep 1; bash -c "ping -q -c 1 127.0.0.1 >/dev/null 2>&1" sleep 1; ausearch -i -m NETFILTER_PKT -ts boot|grep mark=0x12345555 ausearch -i -m NETFILTER_PKT -ts boot|grep contid=|grep $containerid1|grep $containerid2 This should produce an event such as: type=NETFILTER_PKT msg=audit(03/15/2019 14:16:13.369:244) : mark=0x12345555 saddr=127.0.0.1 daddr=127.0.0.1 proto=icmp type=CONTAINER_ID msg=audit(03/15/2019 14:16:13.369:244) : contid=123452,123451 Includes the last patch of https://github.com/linux-audit/audit-kernel/issues/81 See the github issue for the kernel code https://github.com/linux-audit/audit-kernel/issues/90 See: https://github.com/linux-audit/audit-userspace/issues/40 See: https://github.com/linux-audit/audit-testsuite/issues/64 See: https://github.com/linux-audit/audit-kernel/wiki/RFE-Audit-Container-ID Changelog: v5 - address loginuid and sessionid syscall scope in ghak104 - address audit_context in CONFIG_AUDIT vs CONFIG_AUDITSYSCALL in ghak105 - remove tty patch, addressed in ghak106 - rebase on audit/next v5.0-rc1 w/ghak59/ghak104/ghak103/ghak100/ghak107/ghak105/ghak106/ghak105sup - update CONTAINER_ID to CONTAINER_OP in patch description - move audit_context in audit_task_info to CONFIG_AUDITSYSCALL - move audit_alloc() and audit_free() out of CONFIG_AUDITSYSCALL and into CONFIG_AUDIT and create audit_{alloc,free}_syscall - use plain kmem_cache_alloc() rather than kmem_cache_zalloc() in audit_alloc() - fix audit_get_contid() declaration type error - move audit_set_contid() from auditsc.c to audit.c - audit_log_contid() returns void - audit_log_contid() handed contid rather than tsk - switch from AUDIT_CONTAINER to AUDIT_CONTAINER_ID for aux record - move audit_log_contid(tsk/contid) & audit_contid_set(tsk)/audit_contid_valid(contid) - switch from tsk to current - audit_alloc_local() calls audit_log_lost() on failure to allocate a context - add AUDIT_USER* non-syscall contid record - cosmetic cleanup double parens, goto out on err - ditch audit_get_ns_contid_list_lock(), fix aunet lock race - switch from all-cpu read spinlock to rcu, keep spinlock for write - update audit_alloc_local() to use ktime_get_coarse_real_ts64() - add nft_log support - add call from do_exit() in audit_free() to remove contid from netns - relegate AUDIT_CONTAINER ref= field (was op=) to debug patch v4 - preface set with ghak81:"collect audit task parameters" - add shallyn and sgrubb acks - rename feature bitmap macro - rename cid_valid() to audit_contid_valid() - rename AUDIT_CONTAINER_ID to AUDIT_CONTAINER_OP - delete audit_get_contid_list() from headers - move work into inner if, delete "found" - change netns contid list function names - move exports for audit_log_contid audit_alloc_local audit_free_context to non-syscall patch - list contids CSV - pass in gfp flags to audit_alloc_local() (fix audit_alloc_context callers) - use "local" in lieu of abusing in_syscall for auditsc_get_stamp() - read_lock(&tasklist_lock) around children and thread check - task_lock(tsk) should be taken before first check of tsk->audit - add spin lock to contid list in aunet - restrict /proc read to CAP_AUDIT_CONTROL - remove set again prohibition and inherited flag - delete contidion spelling fix from patchset, send to netdev/linux-wireless v3 - switched from containerid in task_struct to audit_task_info (depends on ghak81) - drop INVALID_CID in favour of only AUDIT_CID_UNSET - check for !audit_task_info, throw -ENOPROTOOPT on set - changed -EPERM to -EEXIST for parent check - return AUDIT_CID_UNSET if !audit_enabled - squash child/thread check patch into AUDIT_CONTAINER_ID patch - changed -EPERM to -EBUSY for child check - separate child and thread checks, use -EALREADY for latter - move addition of op= from ptrace/signal patch to AUDIT_CONTAINER patch - fix && to || bashism in ptrace/signal patch - uninline and export function for audit_free_context() - drop CONFIG_CHANGE, FEATURE_CHANGE, ANOM_ABEND, ANOM_SECCOMP patches - move audit_enabled check (xt_AUDIT) - switched from containerid list in struct net to net_generic's struct audit_net - move containerid list iteration into audit (xt_AUDIT) - create function to move namespace switch into audit - switched /proc/PID/ entry from containerid to audit_containerid - call kzalloc with GFP_ATOMIC on in_atomic() in audit_alloc_context() - call kzalloc with GFP_ATOMIC on in_atomic() in audit_log_container_info() - use xt_net(par) instead of sock_net(skb->sk) to get net - switched record and field names: initial CONTAINER_ID, aux CONTAINER, field CONTID - allow to set own contid - open code audit_set_containerid - add contid inherited flag - ccontainerid and pcontainerid eliminated due to inherited flag - change name of container list funcitons - rename containerid to contid - convert initial container record to syscall aux - fix spelling mistake of contidion in net/rfkill/core.c to avoid contid name collision v2 - add check for children and threads - add network namespace container identifier list - add NETFILTER_PKT audit container identifier logging - patch description and documentation clean-up and example - reap unused ppid Richard Guy Briggs (10): audit: collect audit task parameters audit: add container id audit: read container ID of a process audit: log container info of syscalls audit: add containerid support for ptrace and signals audit: add support for non-syscall auxiliary records audit: add containerid support for user records audit: add containerid filtering audit: add support for containerid to network namespaces audit: NETFILTER_PKT: record each container ID associated with a netNS fs/proc/base.c | 55 +++++++++ include/linux/audit.h | 107 +++++++++++++--- include/linux/sched.h | 7 +- include/uapi/linux/audit.h | 8 +- init/init_task.c | 3 +- init/main.c | 2 + kernel/audit.c | 300 +++++++++++++++++++++++++++++++++++++++++++-- kernel/audit.h | 9 ++ kernel/auditfilter.c | 47 +++++++ kernel/auditsc.c | 89 ++++++++++---- kernel/fork.c | 1 - kernel/nsproxy.c | 4 + net/netfilter/nft_log.c | 11 +- net/netfilter/xt_AUDIT.c | 11 +- 14 files changed, 592 insertions(+), 62 deletions(-) -- 1.8.3.1